A radial feed electrochemical machining tool for deformation of integral blade disk cascade

Abstract

The application discloses a blisk cascade deforming radial feeding electrolytic machining tool and relates to the technical field of electrolytic machining. The bottom base has a supporting function; the cathode connecting rod comprises a plurality of cathode blocks which are sequentially hinged; one of the cathode blocks is fixedly connected with the bottom base, and corresponding grooves or holes are arranged on each of the cathode blocks; the strip-shaped object has the ability of deforming and resisting deformation; and the strip-shaped object is arranged in all the grooves or holes. The blisk cascade deforming radial feeding electrolytic machining tool can realize the controllable deformation of the cathode blades on the cathode connecting rod in a spline curve, thereby adapting to the machining requirements of the shape of the twisted blade blisk cascade channel, and improving the machining precision. In addition, the application is suitable for the radial feeding electrolytic machining of the twisted blade blisk and can also be used for machining components with twisted channel structure characteristics, such as closed blade rings, and has universality.

Description

Technical Field

[0001] The present invention relates to the technical field of electrochemical machining, in particular to a radial feed electrochemical machining tool for deforming an integral blade disk cascade. Background Art

[0002] The integral blade disk is the core component of the new aircraft engine, which forms the blade and the wheel into an integral whole. Due to the complex structure of the integral blade disk, the blade surface is a spatial free-form surface, the blade channel is narrow and twisted, and high-performance materials such as titanium alloy and nickel-based high-temperature alloy are widely used. The blade shape is usually electrolytically processed. However, the existing electrolytic processing technology has difficulty in taking into account the blade intake and exhaust edge areas when processing the integral blade disk with large twisted blades. The allowance uniformity of the full contour processing of the blade is poor, and it may even be impossible to process due to interference between the side wall and the side wall of the processed blade channel during the feeding process. Summary of the Invention

[0003] The object of the present invention is to provide a radial feed electrochemical machining tool for deforming an integral blade disk cascade, so as to solve the problems existing in the above-mentioned prior art and improve the machining quality.

[0004] To achieve the above object, the present invention provides the following solutions:

[0005] The present invention provides a radial feed electrochemical machining tool for deforming an integral blade disk cascade, comprising:

[0006] The base has a supporting function;

[0007] A cathode connecting rod, comprising a plurality of cathode blocks, wherein the plurality of cathode blocks are hinged in sequence; one of the cathode blocks is fixedly connected to the base, and each cathode block is provided with a corresponding slot or hole;

[0008] The strip has the ability to deform and resist deformation; the strip is passed through all the slots or holes.

[0009] Preferably, both ends of the strip extend from the slots or holes on both sides of the cathode connecting rod.

[0010] Preferably, it also includes two guide blocks and two moving sliders, the two guide blocks are respectively slidably arranged at the two ends of the strip along the length direction of the strip, and the two guide blocks are respectively rotatably arranged on the moving slider around a first rotating axis. In the processing state, the first rotating axis is parallel to the feed direction of the radial feed electrochemical machining tool for deforming the integral blade disc.

[0011] Preferably, the cathode block is provided with a plurality of liquid inlet channels, the front surface of the cathode block is provided with liquid outlet openings, the back surface is provided with liquid inlet openings communicating with the liquid outlet openings, and one liquid inlet channel communicates with one liquid inlet opening.

[0012] Preferably, one of the liquid inlet channels is formed in the base, and the rest of the liquid inlet channels are formed in the liquid inlet pipe, and the liquid inlet channel formed in the base communicates with the fixed liquid inlet opening on the cathode block.

[0013] Preferably, the side of any two adjacent cathode blocks that are connected is a circular arc protrusion, and the other side is a circular arc groove matched with the circular arc protrusion.

[0014] Preferably, the axis of the cylindrical structure where the circular arc protrusion and the circular arc groove matched on any two adjacent cathode blocks are located is a first axis, and the first axis coincides with the axis of the hinge shaft of the two cathode blocks.

[0015] Preferably, the strip-shaped object is made of a metal material.

[0016] Preferably, the strip-shaped object is in a strip-shaped structure.

[0017] Preferably, the cross-section of the strip-shaped object is not completely the same at different positions.

[0018] The present application has the following technical effects relative to the prior art:

[0019] The whole blade disc cascade deformation radial feed electrolytic machining tool provided by the present application can make the cathode blade on the cathode connecting rod realize controllable deformation of a spline curve, thereby adapting to the machining requirements of the shape of the twisted blade whole blade disc cascade channel, and improving the machining precision and quality.

[0020] In addition, the present application is suitable for radial feed electrolytic machining of twisted blade whole blade discs, and can also be used to machine components with twisted channel structure characteristics such as closed blade rings, and has universality.

[0021] Further, only one linear feed shaft for driving the forward movement of the tool cathode and two linear feed shafts for driving the forward movement of the moving blocks are needed to meet the overall driving force required by the machining method, and the machining method simplifies the driving mechanism of the electrolytic machining. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0023] Figure 1 A schematic structural diagram of a radial feed electrochemical machining tool for deforming a blade disk cascade provided by an embodiment of the present invention;

[0024] Figure 2 for Figure 1 Schematic diagram of the deformation of the radial feed electrochemical machining tool in the middle blisk cascade;

[0025] Figure 3 To have Figure 1 Schematic diagram of a radial feed machining system for a blisk cascade channel of a radial feed electrochemical machining tool for deforming a blisk cascade shown in FIG;

[0026] Figure 4 for Figure 1 Schematic diagram of the liquid discharge of the radial feed electrochemical machining tool for deformation of the integral blade disk cascade shown in ;

[0027] Figure 5 Schematic diagram of the strip structure;

[0028] In the figure: 1-base; 2-cathode connecting rod; 3-cathode blade; 4-strip; 5-guide block; 6-moving slider; 7-liquid inlet pipe; 8-integral blade. DETAILED DESCRIPTION

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] First, some technical terms involved in the embodiments of this application are introduced.

[0032] Electrochemical machining is a non-contact special processing technology that realizes part forming based on the principle of electrochemical anodic dissolution. Its processing process is not limited by the mechanical properties of the material, the tool cathode has no wear and tear, no additional residual stress is generated, the processing surface quality is good, and the material removal rate is high. It has significant advantages in the field of processing integral blades.

[0033] The present invention provides a radial feed electrochemical machining tool for deformation of an integral blade disk cascade, such as Figures 1 to 5As shown, it comprises a base 1, a cathode connecting rod 2 and a strip 4, the strip 4 can also be called a keel, the base 1 has a supporting function; the cathode connecting rod 2 comprises a plurality of cathode blocks, each cathode block has a cathode blade at the top, the plurality of cathode blocks are sequentially hinged, each hinged shaft is parallel to each other; one of the cathode blocks is fixedly connected with the base 1, so that the base 1 can support each cathode block, and each cathode block is provided with a corresponding groove or hole; the strip 4 has the ability of deformation and resistance to deformation, which can produce deformation and support each cathode block to keep the set state; the strip 4 is provided in all the grooves or holes, and the strip 4 can move relative to the cathode block.

[0034] The whole blade disc cascade deformation radial feed electrolytic machining tool provided by the application can realize the controllable deformation of the cathode blade 3 on the cathode connecting rod 2 in the form of a spline curve, thereby adapting to the machining requirements of the shape of the twisted blade whole blade disc cascade channel, and improving the machining precision.

[0035] In addition, the embodiment of the application is suitable for radial feed electrolytic machining of the twisted blade whole blade disc, and can also be used for machining components with twisted channel structure characteristics such as closed blade rings, and has universality.

[0036] In some embodiments, the two ends of the strip 4 extend from the grooves or holes on the two sides of the cathode connecting rod 2.

[0037] In this embodiment, the two ends of the strip 4 are driven to move towards the two sides of the cathode connecting rod 2, and the relative movement of the cathode blocks thereon is driven, and the bending deformation of the cathode connecting rod 2 as a whole is realized.

[0038] In some embodiments, the embodiment of the application further comprises two guide blocks 5 and two movement sliding blocks 6, the two guide blocks 5 are slidably arranged at the two ends of the strip 4 along the length direction of the strip 4, and the two guide blocks 5 are rotatably arranged on the movement sliding blocks 6 around the first rotation shaft, and in the machining state, the first rotation shaft is parallel to the feed direction of the whole blade disc cascade deformation radial feed electrolytic machining tool.

[0039] In this embodiment, only one straight feed shaft for driving the cathode to advance and two straight feed shafts for driving the movement sliding blocks 6 to advance are required to meet all the driving forces required by the machining method when electrolytic machining is performed, and the machining method simplifies the driving mechanism of the electrolytic machining.

[0040] Specifically, the guide block 5 is rotatably arranged on the movement sliding block 6 around its own axis, when the movement sliding block 6 moves to one side, the guide block 5 rotates relative to the movement sliding block 6 along with the bending of the strip 4 and moves on the strip 4, and the movement sliding block 6 does not need to change its own position, and only needs to move along a straight line, which simplifies the driving mechanism for driving the movement sliding block 6, and the driving mechanism only needs to drive the two ends of the strip 4 to move along a straight line to realize the deformation control of the cathode connecting rod 2.

[0041] In some embodiments, the present invention further includes multiple liquid inlet channels, a liquid outlet is provided on the front processing surface of the cathode block, a liquid inlet connected to the liquid outlet is provided on the back surface, and one liquid inlet channel is connected to one liquid inlet.

[0042] Specifically, one of the liquid inlet channels is formed in the base 1, and the remaining liquid inlet channels are formed in the liquid inlet pipe 7. The liquid inlet channel formed in the base 1 is connected to the liquid inlet port on the fixed cathode block. Of course, in some embodiments, all the liquid inlet channels can also be formed in the liquid inlet pipe 7, and the liquid inlet pipe 7 is a flexible tube to facilitate the movement of each cathode block.

[0043] In this embodiment, the liquid inlet channels corresponding to the cathode blocks are controlled individually, which can achieve uniformity of the electrolyte flow field in the processing area and ensure the stability of the processing process.

[0044] In some embodiments, one side of any two adjacent cathode blocks connected to each other is a circular arc protrusion, and the other side is a circular arc groove matching the circular arc protrusion.

[0045] This embodiment improves the connection accuracy between any adjacent cathode blocks, thereby improving the processing accuracy.

[0046] In some embodiments, the axis of the cylindrical structure where the matched arc protrusions and arc grooves on any two adjacent cathode blocks are located is the first axis, and the first axis coincides with the axis of the hinge shafts of the two cathode blocks.

[0047] This embodiment further improves the connection accuracy between any adjacent cathode blocks during the movement process, thereby improving the processing accuracy.

[0048] In some embodiments, the strip 4 is made of metal material, specifically a strip-shaped structure.

[0049] The strip 4 can be made of a stainless steel sheet with a thickness of 0.6 mm and a width of 3 mm and a surface-insulated layer.

[0050] When implementing, if Figure 3 、 Figure 4 As shown, the shape, number, and curvature of the cathode blocks are designed based on the blade profile of the blisk to be machined. During machining, the blisk is connected to the positive power supply, and the tool cathode is connected to the negative power supply. Electrolytic machining parameters are set and electrolyte is introduced. Electrochemical dissolution occurs on the workpiece surface opposite the cathode end. As the base 1 drives the cathode connecting rod 2 forward, the guide block 5 simultaneously bends the strip 4, causing it to deform. The dissolving cross-section also gradually bends, forming the desired twisted blade channel. After machining is complete, the power is turned off and the electrolyte flow ceases.

[0051] Taking the strip 4 as a plate-like structure as an example, if the shape and size of each cross section of the strip 4 along the length direction are consistent, then its moment of inertia remains unchanged, that is, the ability to resist deformation is consistent everywhere. When one end of the strip 4 is loaded, the deformation increases along the length direction as the bending moment increases. The controllable variables of the deformation are relatively small, and the deformed shape cannot be processed into the required twisted blade channel.

[0052] Based on this, in some embodiments, such as Figure 5 As shown, the cross-sections of the strip 4 are not exactly the same at all locations. By adjusting the cross-sections of the strip 4 at all locations, its moment of inertia is changed, thereby changing its ability to resist deformation, so that the desired shape can be achieved by simply applying a load to the ends of the strip 4.

[0053] Specifically, still taking the strip 4 as a strip-shaped structure as an example, a strip with the same cross-sectional shape and size along the length direction is called a constant-width rod, and vice versa, a variable-width rod. The difference between a constant-width rod and a variable-width rod is that the different widths of the variable-width rod increase or decrease the moment of inertia at each cross-section. According to the rod deflection curve equation EI*(d 2 w / dx 2) =M(x), it can be seen that if the bending moment M(x) remains unchanged, the material elastic modulus E remains unchanged, the smaller the moment of inertia I, the greater the lateral displacement at the section. In order to achieve the required cathode blade deformation, it is necessary to establish a relationship model between the lateral displacement of each section of the variable-width rod and the width of each section of the variable-width rod under different load conditions. The width distribution of the variable-width rod along the axial direction is designed according to the required deformation, and finally the cathode blade deformation control is completed by applying a load to the end.

[0054] An embodiment of the present invention further provides a method for using the radial feed electrochemical machining tool for deforming a blade disk cascade as described above, comprising: driving the strip 4 to bend and driving the cathode block to move relative to form a set shape.

[0055] The embodiments of the present invention have all the advantages of any of the above embodiments, which will not be described in detail here.

[0056] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A radial feed electrochemical machining tool for deformation of an integral blade disk cascade, characterized by: include: The base has a supporting function; A cathode connecting rod, comprising a plurality of cathode blocks, wherein the plurality of cathode blocks are hinged in sequence; one of the cathode blocks is fixedly connected to the base, and each cathode block is provided with a corresponding slot or hole; A strip, the strip having the ability to deform and resist deformation; the strip is inserted into all the slots or holes; the two ends of the strip extend from the slots or holes on both sides of the cathode connecting rod; it also includes two guide blocks and two moving sliders, the two guide blocks are slidably arranged at the two ends of the strip along the length direction of the strip, and the two guide blocks are rotatably arranged on the moving slider around a first rotating shaft. In the processing state, the first rotating shaft is parallel to the feed direction of the radial feed electrochemical machining tool of the integral blade disk blade grid deformation; it also includes multiple liquid inlet channels, a liquid outlet is provided on the processing surface of the front of the cathode block, and a liquid inlet connected to the liquid outlet is provided on the back, and one of the liquid inlet channels is connected to one of the liquid inlet; one of the liquid inlet channels is formed in the base, and the remaining liquid inlet channels are formed in the liquid inlet pipe, and the liquid inlet channel formed in the base is connected to the liquid inlet on the fixed cathode block.

2. The radial feed electrochemical machining tool for deformation of an integral blade disk cascade according to claim 1, characterized in that: On one side where any two adjacent cathode blocks are connected, one is a circular arc protrusion and the other is a circular arc groove matched with the circular arc protrusion.

3. The radial feed electrochemical machining tool for deformation of an integral blade disk cascade according to claim 2, characterized in that: The axis of the cylindrical structure where the arc protrusions and arc grooves matched with each other on any two adjacent cathode blocks are located is a first axis, and the first axis coincides with the axis of the hinge shafts of the two cathode blocks.

4. The radial feed electrochemical machining tool for deformation of an integral blade disk cascade according to claim 1, characterized in that: The strip is made of metal material.

5. The radial feed electrochemical machining tool for deformation of blisk cascade according to claim 1, characterized in that: The strip is a lath-shaped structure.

6. The radial feed electrochemical machining tool for deformation of an integral blade disk cascade according to claim 1, characterized in that: The cross-sections of the strips are not completely the same at all locations.

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